Babbitting jig



Sept. 24, 1929. R, A JOHNSON 1,728,971

BABBITTING J1@ Filed July 7. 192e sheets-sheet 1- BY .m1,

ATTORNEY Sept. 24,` 1929- R. A. JoHNsoN 1,728,971

BABBITTING JIG Filed July 7, 1928 3 Sheets-Sheet 2v INVENTOR R..cf41hn.5on

ATTORNEY Sept. 24 1929 l R.. JoHNsoN y 1,728,971

BABBITTING JIG Filed July fr, 192e s sheets-sneer 3.

INVENTOR R.A.J0I2126012 BY. C? .52.; AAT..

ATTORNEY Patented Sept. 24, 1929 UNITED STATES PATENT OFFICE RAYMOND A. JOHNSON, OF DELANO, CALIFORNIA, ASSIG-NORA OF ONE-'HALF T0 GEORGE BRANCH,` OF DELANO, CALIFORNIA BABBITTING JIG Applicationled July 7, 1928. Serial No. 291,062,

j This invention relates to a device for babbitting bearings and especially to one h for casting the babbitt in the caps of connectmgrods, main bearings and similar parts of gas engines and other machinery. A

The principal object of my invention 1s to provide a jig for this purpose so constructed that the cap to be babbitted may be rigidly and quickly clamped in position on the 31g 1n 1o such a manner that the babbitt when poured is properly centered in the cap and will have the proper thicknessk and general form desired. Y

A further object of this invention is to arrange the structure so that merely by interchanging a few simple parts, caps of any d1- mensions Within the usual range may be handled with equal facility.

A further obj ect of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purpose for which it is designed.

These objects I accomplish by means of such a structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.`

In the drawings similar characters of reference indicate corresponding parts in the several views:

Fig. l is asectional elevation of my improved jig showing cap to be babbitted 1n place on the jig but not clamped.

Fig. 2 is a similar view of the cap as clamped and the babbitt poured.

Fig. 3 is a sectional plan taken on the line 3-3 of Fig. 2. p

Fig. 4L is a perspective view of a symmetrical fillet size controlling ring.

Referring now more particularly to the characters of reference on the drawings, the frame of the jig comprises a vertical plate 1 having a ,horizontal extension 2 projecting from one side thereof intermediate its ends, said extension being adapted to rest on and be secured to a work bench or the like.

Adapted to abutagainst the front face of the plate 1 is a semi-circular mandrel 3 of suitable length, which is provided with locating dowel pins 4 to seat in the plate and with astud bolt 5 whereby the mandrel may be removably but rigidly secured to said plate. The diameter of the mandrel corresponds to the diameter of the shaft to ycooperate with the bearing cap, and a number of different lsizes of mandrel, all interchangeable, are provided so that the jig may be used for casting bearings for use onV any ordinary sized shaft.

The cap 6 to be babbitted straddles the mandrel and also rests against the plate 1. Such caps, as usual, havetransversely spaced bolt holes 7, and these holes are utilized to centralize thecap relative to the mandrel and to 'secure the cap in place by the following means. Journaled in the plate 1 and also in lugs 8 projecting upwardly from the outer end of the frame member 2 are transversely spaced horizontal rods 9, having bosses 19in front of the plate 1 through which horizontal pins 4llare transversely'slidable. These pins are graduated as at 12 and are held at any position in the bosses by set screws 13. From the adjacent ends of the pins tapered nubs 14 project toward'the plate 1 so as to enter the bolt holes 7 These pins are initially set in the bosses so `thatthe distance between the `v nubs is the same'distance as that between the bolt holes, which distance is of course known. The graduations on the pins are so numbered that when both pins are set at the same points relative to their respective bosses, the nubs will be then equi-distant from the center line of the mandrel.

A When the nubs are frictionally engaged with the bolt holes, therefore, the cap will be centralized relative to the mandrel as will be evident.

The nubs are thus moved into engagement with thebolt holeskby the` following means. At their rear ends the rods 9 are connected by a cross bar 15. v Slidable through this cross 90 bar is a rod 16, which at its forward end is connected to a crank arm 17 projecting from a transverse shaft 18, journaled on the member 2. A radially extending operating handle 19 is connected to one end of the shaft 18fto 95 one side of the frame, so as to enable said shaft to be easily rotated. A compression spring 20 disposed about the rod 16 bears at one end against the cross bar and at the other end against a collar 21 fixed on the rod between 100 the bar and crank. It will, therefore, be

. seen that if the handle is turned in a direction so `as to push -the rod rearwardly through the cross bar, the resistance of the spring will cause the rods 9 and the parts connected thereto, to be moved rearwardly until the nubs frictionally engage the bolt holes. Further movement of the handle in the same direction will then compress the spring so that the nubs will press the cap firmly against the plate 1. The handle is turned until the crank engages a projection 22 on the plate 2, as shown inl Fig. 2, at which point the crank is past dead center and the spring cannot act to retract the nubs. The bore of the cap is thus concentric with and spaced from the mandrel, the size of the latter relative to the bore bein such as to give the desired thickness of babitt.

' `The ends of the cap are then closed in to form a pouring chamber for the babbittby means of the following arrangement. Slidable on the mandrel on both'sides of the cap are semi-circular sleeves 23, a pair'of which is provided for each mandrel so as to match with the same.

The sleeves at their adjacent ends have enlarged heads 24 which are of greater radius thanA the cap 6, said heads being recessedto4 a depth equal to the desired projection of the babbitt beyond the ends of the cap. The heads are arranged to removably receive segmental rings 25 Whose router edges lie flush with the outer edges of the heads and whose inner radius is greater than the bore of the cap. A number of rings having varying internal sizes are provided for use in each set of sleeves so as to provide for different depths of end fillets or flanges on the babbitt outwardly of the ends of the cap as clearly shown in Fig. 2. i

j The sleeves at their opposite ends are provided with sockets 26 into which the adjacent ends of supporting rods' 27 removably project, the sleeve being secured to the rods by wing screws 28. The rods are bent to form U-shaped yokes, extending away from the sleeves over the top and bottom vof the plate 1in suitable clearance relation thereto, and then, toward each other back of said plate, passing through guide bosses 29 projecting from the plate. Between the bossesV rigid arms 30 are secured* to and project radially from the rods. Vertical link rods 31 ass freely through the arms. The rods at t eir adjacent ends are connected to opposed crank Y arms 32 projecting from a transverse shaft 33,V journaled Von the member 2, and which is provided at its end opposite the handle 19 with a radial operating handle 34:. Acompression spring 35 disposed about each rod bears at one end against-the corresponding arm 3() and at the other end against a collar 36 fixed on the rod atits outer end.

It will therefore be seen that a rotation of the handle 34 in a direction to cause the upper link to be lowered and the lower link to be raised will cause the yokes 27 to be moved toward each other.

The sleeves 23 will then be slid along the mandrelwithout compressing the springs 35 until the heads 211 abut against the cap 6. A further rotation of the handle will cause the springs to be compressed which will cause afirm pressureto be exerted to hold the sleeve heads against the cap so as to form a tight joint. -Owing to the use of the springs, caps of different lengths may be thus engaged by the sleeves with equal vfacility as will be evident. When the sleeves are thus positioned and the cap clamped in place by manipulating the handle 19 as previously explained, the babbitt is poured into the space between the mandrel, cap and sleeves through an opening 37 provided in the upper one of said sleeves. The babbitt bearing 38 of theproper size throughout is thus immediately formed in connection with the cap, and since the mandrel has a smooth surface and is of the identical size as the shaft on which the cap is to be used, the bearing is then ready to be put into service without further treatment or linishing being necessary.

From the foregoing description it will be readily seen that I have produced sucha device as'substantially fulfills the objectsof the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the inJ vention, as defined by the appended claims.

Having thus'described my invention what l claim as new and useful and desire to secure by Letters Patent is:

1. A babbitting jig for a bearing cap including a semicircular mandrel of the same diameter as the shaft with which the cap cooperates, a fiat plate against which the mandrel and cap abut, means for rigidly securing the mandrel in a definite place on'said plate, closure members for the ends of the cap slidably mounted on the mandrel, tapered y nubs for engagement with the outer ends of the opposed bolt-holes of the cap; transversely extending pins from which said nubs project, means mounted in permanent relation with the plate for supporting said pins in a 1 the mandrel in a definite place on said plate, closure members for the ends of the cap slidably mounted on the mandrel, tapered nubs for engagement with the outer ends of the opposed bolt-holes of the cap, transversely eX- tending pins from which said nubs project, rods supporting said pins and slidably mounted in permanent connection with the plate, said rods being parallel to the nubs, and means mounted in connection with the plate for moving said rods longitudinally.

3. A device as in claim 2, in which said last named means comprises a cross bar connectn ing the rods, a rod slidable through the bar, a turnable crank-arm connected to one end of the arm, and a compression spring on said last named rod between the cross bar and crank.

4;. A babbitting jig for a bearing cap including a mandrel of the same size as the shaft with which the cap normally cooperates, means for centralizing and securing a cap about the mandrel, closure members for the ends of the cap slidable along the mandrel, yokes connected to said members and mounted for sliding movement parallel to the mandrel, opposed arms projecting from the yokes, link-rods freely slidable through the arms and projecting toward each other, opposed crank arms to which the adjacent ends of the links are connected, means for rotating the crank arms as a unit, collars on the outer ends of the links, and compression springs between the collars and the corresponding arms.

5. A babbitting jig for a bearing cap including a mandrel of the same size as the sha'tt with which the cap normally cooperates, means for centralizing and securing a cap about the mandrel, closure members for the ends of the cap slidable along the mandrel, a pivoted lever, and flexible connecting units between said lever and the closure members arranged for moving the latter toward the cap and arranged to permit of Variations in the extent of such movement with the same extent of movement of the lever.

In testimony whereof I aflix m signature.

RAYMOND A. JOlINSON. 

